warn-access: Fix up warning_at arguments

warn-access: Fix up warning_at arguments

A warning regression fix I'm about to post warns (and breaks bootstrap due
to that) on the following spot.  Seems it is a copy and paste from
earlier code that mentions the %qD variable instead of talking about
unnamed temporary.

2022-01-21  Jakub Jelinek  <jakub@redhat.com>

	* gimple-ssa-warn-access.cc (pass_waccess::warn_invalid_pointer):
	Avoid passing var to warning_at when the format string doesn't
	refer to it.